Pleased to report that all's well now
I had passed the comments to our company's "IT Professional" and he couldn't get it working. Maybe he hadn't had enough
curry recently - not that I'm implying anything "non-PC"
This morning "The Boss" asked me to take over and, after reading the instruction book
(if all else fails, read the manual) I managed to get it all running in an hour.
Yes, it does support dynamic IP (just set the "ISP IP" setting to 0.0.0.0) and now Browsers and POP clients work just fine all through the office. Half the time was spent removing various non-standard settings that our "IT Professional" had inserted into the system
Thanks for all the comments and help!
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What Goes Around . . . . .
. . often makes a better landing